MOSQUITO BIOLOGY 

 DESCEIPTION 



135 



Howard, Dyar, and Knab (14) give the following description: 

 "Female. Proboscis rather long, subcylindrical, uniform ; labellae 

 conically tapered ; vestiture black ; setae on the labellae minute, out- 

 standing. Palpi short, about one-fifth as long as the proboscis, black, 



Fig. xliv. Adult of red-backed mosquito. A'edes implacabilis Walk. (After 

 John B. Smith.) 



the setae moderate, bristly. Antennae filiform the joint subequal, ru- 

 gose, pilose, black, second joint slightly thickened and paler; tori 

 subspherical, with a cup-shaped excavation, luteous brown, some white 

 scales on inner side; hairs of whorls sparse, moderate, black. Clypeus 

 rounded triangular, prominent, black, nude. Eyes black. Occiput black, 

 scales on vertex narrow, on the sides broad, yellowish white on vertex, 

 with some golden brown scales each side of middle line, dull white on the 



